im busy putting a 1.8t out of an n reg a4 into a 90quattro, and its getting close to wiring it up. before i knew about the 3"maf and bigger injectors working to up the power i bought a chipped ecu off ebay as it was a decent price however i don't like the big rubber surround the harness has where it runs along the back of the bulkhead, so i went to re-read the thread about alternative ecu's and then spotted the picture of the 2 ecu's 1 on top of the other, and noticed the ecu i bought is different to both lol i have a hraness and ecu off a 98 a6 1.8t so not too worried. anyhoo, questions:- 1. What is this ecu for? 4B0 906 018 AA 2. if the agu ecu fits on a b5 loom(which ever1 it fits), surely the agu harness will fit the ecu lol so i can make the wiring look a bit neater???